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.