I recently ordered from Gameyeeeah, psxboy, MiniOnlineStore, and Leetmod. I'll relate my experiences, which hopefully will be useful to those asking about various stores.
Gameyeeeah and psxboy both gave me the usual repeated "we'll have it in a few days" concerning products that they said were in stock when I ordered, but weren't really in stock. This went on for several weeks, and it became clear that they weren't getting the product in stock anytime soon. However, both canceled my order quickly when I requested it. E-mail response time was 1 to 2 days for both.
One of the items I ordered from psxboy was in stock, but they didn't have the color I wanted. They sent me an e-mail within two days of my placing the order asking if I wanted them to send a different color. I asked them to send a different color, and they sent the order within a day but it took about a week for me to get it.
MiniOnlineStore had the least professional website of the four, and it wasn't clear to me that they had received my PayPal payment after I placed the order (I wasn't taken back to their website and there is no status information stored on their website). I immediately e-mailed them to ask whether they had received the payment, and after not receiving a response after 3 days e-mailed them again to ask them to cancel the order. They responded the following day and then sent the order anyway, even though I asked them not to. It may have been a communication problem since the person sending the e-mail wasn't a native English speaker. After a lot of polite back-and-forth via e-mail (each time taking approximately 2 days for them to respond) they agreed to refund my money and I agreed not to sign for the package when it arrived so that it would be sent back to them. It is now about a week later and I have yet to receive the package, nor have they refunded my money. I'll update this post if the status changes. As it stands, I think the store is reputable, but slow both in terms of responding to e-mails and in terms of issuing refunds.
Leetmod's website is excellent and shows how many of each item is in stock. Furthermore, the website doesn't show items that aren't in stock. They responded to e-mail the same day. They sent my package the day I ordered it (free shipping to the U.S. and Canada), and I received it two days later.
MINIONLINESTORE UPDATE: After not receiving the refund or the item, I sent MiniOnlineStore an e-mail on March 15 and never received a response. On March 25, they finally replied and apologized that they hadn't responded earlier (something about the Easter holiday). They again offered to issue a refund within 2 days. Again, no refund. It is now April 28, and I have neither received my refund from MiniOnlineStore nor have I received the item. They also haven't responded to any e-mail since.
-Bri