My understanding is that throughout the Amiga's life, IBM compatible PCs were consistently 2x to 4x the price of the then-current and comparable home computer Amiga model in the UK.
I'm restricting myself here to the period 1988 to 1995, and the home computer models of Amiga - 500, 600, 1200 - and not the workstation models (1000, 2000, 3000, 4000) since that's what you've asked about. (It's also what I'm more familiar with, I've never seen nor used a workstation Amiga...)
The Argos prices below for PCs include a monitor (which would be a significant contributor to the price) but not a sound card, which could easily be £200 for a first party Sound Blaster series or £100 for a clone, so a like-for-like word processing machine that can also play Secret of Monkey Island, Lemmings or Zool would easily demonstrate the 2x-4x difference.
1992/1993 were the start of the IBM compatible PC being an uncommon but not unreasonable purchase for the home office user in terms of price and utility. There were many bundles later on as Windows 95 came out, but there was no active successor to the 'home micro' form factor, so price comparisons are moot after 1995.
These are the prices from Argos, a chain of mail-order/walk-in-collect catalogue shops that were very popular in the 90s in the UK. If you were on the high street looking for a family computer, you'd probably get your home micro from a dedicated shop like Dixons, Currys, Tandy, Rumbelows, etc... but Argos is a good example of 'department store' consumer pricing.
These are the earliest mentions I can find so far for IBM PC compatibles vs. Commodore Amiga/wedge computers in this series.
Argos Superstore 1992 Spring/Summer: (archive.org link)

Home microcomputers:
- Atari 520 STE Discovery Extra Pack £299 512K RAM, Final Fight, Sim City, Robot Monsters, 9 Lives, Neochrome, ST Tour, mouse.
- Commodore Amiga 500 Cartoon Classics Pack £399 1MB RAM, Deluxe Paint III, Captain Planet, The Simpsons, Lemmings. Mouse, TV modulator.
- Atari 1040 STR Family Curriculum Pack £399 1MB RAM, Play and Learn, Junior School ,GSCE Core Curriculum, Creative Computing, Business Computing, mouse.
- Acorn BBC A3000 Learning Curve Computer Pack £995 1MB RAM, 14 inch monitor with stereo. 1st Wordplus, PC Emulator, DOS, Pac Mania, Educational and productivity software. Mouse.
IBM Compatibles:
- Smith Corona PC 210/286 £999 inc. 14 inch monitor 80286 16Mhz. 1MB RAM. 40MB HDD. Smith Corona Word Processor. microsoft Works. Mouse.
- Olivetti PCS286S Computer £1199 inc. 14 inch monitor 80286 16Mhz. 1MB RAM. 40MB HDD. MSDOS, Works, Life & Death, Chess. Mouse.
Argos Superstore Autumn/Winter 1993: (archive.org link

Home microcomputers:
- Commodore Amiga 600 Weird Wild and Wicked Pack £219, 1MB (internal chip RAM), Deluxe Paint III, Silly Putty, Grand Prix, Pushover, mouse, TV modulator (I assume it's internal, since it's an A600).
- Commodore Amiga 1200 £379, 2MB (internal chip RAM - that description has to be wrong) Deluxe Paint III, Sleepwalker, Zool, mouse.
- Acorn A3010 £499, 1MB RAM, Discovery Pack, Easiword, Quest for Gold.
IBM Compatibles:
- Amstrad PC7486SLC £999 inc. monitor, 33Mhz, 2Mb RAM, 130MB HDD, DOS 6, Win 3.1, PFS WindowWorks Office suite.
- Amstrad Mega PC386SX £749 inc. monitor 25Mhz, 1MB RAM, 40MB HDD, DOS 5, Lotus Works. Plays Mega Drive games too and comes with Sonic 2, Eurpoean Club Soccer, Toejam & Earl, Shadow of the Beast.
From a non-consumer-oriented perspective, I've found a catalogue for the UK computer supplier WeServe on archive.org dated 15th March 1991. They've got lots of SKUs for computers of all kinds: Acorn, Amiga, PC.
Some selected items to save you from reading the full catalogue:
- A500 512KB RAM base + modulator £319
- A500 512KB RAM Batman Pack + modulator £359
- A500 512KB RAM 'Games Pack' + modulator + monitor £585
- Amstrad 8086 512KB RAM, CGA, floppy only + mono monitor £350
- Amstrad 8086 512KB RAM, CGA, floppy only + colour monitor £437
- Amstrad 286 1MB RAM, VGA, 40MB HDD + 14inch colour monitor £1173
- Amstrad 386 1MB RAM, VGA, 40MB HDD + 14inch monitor £1592
One could get an 8086 XT-tier PC compatible with no hard drive for the price as an Amiga 500, if you had a use for such a thing. :)
Here's the complete sections for Amiga computers*; and Amstrad, Hyundai and IBM PCs. There are other pages for other brands.
Prices are {excl. VAT .... incl. VAT }
(VAT at the time was 15.0%, but it did increase to 17.5% days later!).

(*I love that the Atari and Amiga sections are listed as '-- micros' as they should be. :) )