Hello cgagne, welcome to the forum these are some great looking rugs you're looking at.
Any numbers within this post are just for loose reference. I didn't count the KPSI for the qums.
Presumably you should be able to get a better deal being closer to the source. Not always the case. If you're planning in purchasing all four rugs, you should get a much better deal. I would negotiate as much as possible.
As Krow assessed, I think these are probably real qum, but it never hurts to do a burn test. Rubbing your hand over the pile fast with an open palm may help too. If your hand gets hot after light pressure and to and fro movement, it's probably real silk. As for the prices, they vary a lot based on MANY factors. I know on ebay you can get roughly 400-500 KPSI silk qum in OKAY design execution and OKAY color in 2x3 for around
$750 or $125 per square foot from a ebay "dealer". Retail showroom may or may not be more. Larger pieces tend to go for more money per foot but this is usually for much larger sizes. 3x5 is a great size for hanging, you will probably get this around 2k with okay design & colors. For excellent design execution and excellent colors, I would add up to 50% for ebay price or around 3k for 3x5. The prices are fluctuating a lot. One retailer I spoke with said qum prices have nearly doubled in the last 7 years. some dealers have accounted for this in asking prices for old stock, some have not. Generally brick and mortar store US retail would probably bring it up much more (and usually justifiably so if they're an importer). Since you're overseas, I would negotiate the prices, especially if youre getting several. The green piece looks like a better rug from a construction and design standpoint, but the colors may not be as conducive to demand as the blue tree of life qum
per the oushak, it's probably a peshawar rug with an oushak design. Often these are made in pakistan by afghan refugees. In the states that could be anywhere around 750-1200 "ebay retail" if it's the type I think it may be. better pieces on ebay will go for around 1500 in 8x10 (
example here is 9x12), showroom retail perhaps as much as 2700. Bad pieces with "minor flaws" such as a bad was will go for sometimes much, much less. Even too much open field, or otherwise seconds goods can be 60% less.
The last piece from Turkey I have litle experience with and don't want to misguide. I would negotiate. at these prices I would say they're between ebay prices and retail, some closer to retail, some closer to ebay. I would not purchase with the intent for resale with that being said. How much pressure you put on the seller is up to you, but from my experience the best "pressure" is being passive aggressive and showing your willingness to have a "take it or leave it" attitude no matter how much you like the rugs. If you walk away with the group for 40% less than what they are asking, I think you will do pretty darn good. If you buy at the asking price, you could probably get just about the same here in the states with a fair amount of research, browsing and an e-bay account