You can find some offer in internet. But dont buy, because its big risk. Cryptocurrency cant be official accepted for payments in contract, because it is not a legal  in many countries. The main risk for the buyer here is that the fact that he fulfilled the obligation to pay the object of the contract (apartment, house, island) may  not be recognized of country.If you buy apartament using altcoins, contract must be registration and there are must be indicated national money(dollar, euro, ect.). National money appeared in the contract, and you paid for appartament with cryptocurrency, then at the seller’s claim this transaction may be considered illegal by the court and you must give back appartament