The most famous Bugatti race car, without a shadow of a doubt, is the Type 35. It won many races, mostly between 1925 and 1933.
Yes, there is a 1:24 diecast model of a Type 35 Bugatti on the market, but the listings on eBay were mostly with starting bids or buy-it-now prices between £85-150, and that's way too much for me .... But then I saw a Type 35 on eBay as part of a job lot (together with other (smaller scale) models, mostly Type 35 but also two Mercedes) with a very low starting bid.
I guess the listing went under the radar, because I won the bidding with a total of just £34. So that means I got the 1:24 Type 35 for ~£21 (still under my self-imposed £25 maximum!)
It's a Franklin Mint model, so heavy and highly detailed. There was some slight damage: the windshield was missing, but that was easy to replace with a piece of transparent plastic, cut to shape.
And for the others I haven't yet found a permanent place in the house, but that will happen soon, I'm sure!