The TMS9918 is still available, which is nice.
But are there any other (better) video chips still on the (after-)market in any numbers? Obviously Commodore's VIC-II is not one of them.
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Since you seem to consider buying on ebay to qualify as available, I'd nominate the TI 34010 and 34020. Looks like you can pick them up for around $50-60 apiece (though quantity available may be open to question--most seemed to be lots of one).
There seem to be at least a few Intel 82876's available as well (for around the same price).