Try eBay, Reddit Mechmarket, or the classifieds here. The only keyboards with real Topre switches are the ones you listed, and you're always going to pay a premium for those. You might also look at the Niz/Plum "Nopre" keyboards, too. They're cheaper than real Topres, but not by a huge amount. The one advantage to them is that they're all silenced and compatible with MX keycaps. To get that on a Topre, you'd need to buy a Realforce RGB and a set of silencing rings, which puts you close to $300.