Sometimes retailers will put silly prices on stuff temporarily for various reasons though its usually 9999.99 to stop people buying them. (Slightly backfires when the original price was £25,000 as I saw happen once at work).
I think you are right judging by the "limit 5 per customer" they probably had them on sale really really cheap and sold out then raised the price to something stupid quick so they could stop sales.
Either that or someone put them on sale by accident for $80.
If anyone is still bothered at this point the actual page is available via link below
Newegg.com $8000 R9 290
still showing $8000 but if you click on it says "out of stock"
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