Advertised houses for sale

YES.

Some local sites you would want to check out are imot.bg holmes.bg homes.bg

You may also want to check out olx.bg or bazar.bg as they have many listings from owners (and from agencies).

Of course, you may also want to look at agency sites.

Some estate agents will let you buy with a pay monthly deal. It is better than renting and you can pay as you go. You have to be careful... get a good lawyer that is registered with the bar in Bulgaria (ask for their number and check yourself they are registered to practice law).  Always get the lawyer to check the deal.... it is not expensive and it can all be done by email.

But I can recommend mowlem.eu Estate Agent in Ruse.  They have low cost houses in Ruse area to buy on pay monthly.  All their staff speak good English too.

Thanks for the replies.
If one finds a seemingly trustworthy estate agent, is there a good reason not to trust one of the conveyancing legal people that the estate agent may recommend?