both companies I linked to are extremely reputable and have been around a very long time. Just unbderstand that Russian AKs are MUCH better quality than any of the cheap copies. The sights aren't canted, the finish is better, and they are more accurate. They also have chrome lined bores that the recent US builds don't have since the original barrels aren't allowed to be imported with the parts kits they are built from.
The Saigas come in a "sporting" configuration and have to be retrofitted with some US parts to return them to a military look. That's why the sporting Saigas are only $300.
You can do the conversion yourself if you like projects, but I think it's worth paying them $50 for their time an labor to do it for you.
You can find a less expensive Romanian WASR, and they are good rifles, but they aren't as nice of a rifle.
There are plenty of decent used AKs out there, but if you don't know what to look for you could end up with a homebuilt terd that you have to spend time and money on in order to make it right.
I recently had 4 AKs for sale here for around $400. I ended up selling 2 at a gunshow, one on here and one to a friend FTF. They didn't last long. If you look around you can find one at a good price, but you have to be ready to complete the transaction quickly by having a FFL ready to do transfers for you cheap.