What is a budweiser carousel lamp worth?

Not really a lot of info on the age or condition or theme of your lamp. So I really can't answer your question to the fullest. I can say barware sells very well on eBay. Any and all barware sells and sells well. A couple of hot items you would not expect, paper coasters and bar trays. Those with an oldtime known beer or ale brand name are highly sought after by collectors.

Beer lamps, beer mirrors and signs, especially neon will sell very well. This Budweiser carousel lamp recently sold on eBay:

BUDWEISER CLYDESDALE ROTATING CAROUSEL BAR LIGHT RARE

It is considered RARE. If this is your lamp, congratulations! 455.00!