I was only able to locate 1 dropshipper that sold the refurbished products you are interested in - Link hidden: Login to view
But here are a few more wholesalers that also carry the products you are looking for - Link hidden: Login to viewLink hidden: Login to viewLink hidden: Login to viewLink hidden: Login to viewLink hidden: Login to view
As for MA Labs, they are not part of our directory of suppliers so that would be the first reason we have no information on them and second maybe no one's used them here yet or just haven't posted anything at all.
MA Labs has been online 1995 and seem like a legitimate supplier with several offices in the US. Although I am not sure what type of payment methods they are currently accepting. However, the reviews about them are mixed, so it's a bit of a challenge to ascertain just how good they are as a supplier. Here's one set of reviews where customers have given both good and negative reviews - Link hidden: Login to view
Hope this helps :) All the best!