For the record, here's my experience with Leaders Hobby:
I ordered four of the Transmetic 4S 10Ah 10C packs a couple of months back for my competition bike, at that time they were only $32 each (which was even better than the $41).
However, I then received an email from a lady there saying that the parcel was too big to be posted but could I please send some more money!!!! I told her sorry no can do (had already paid around $40 for postage). By this time, the stock with 4mm connectors had disappeared, so I said just send ones with whatever type of connectors you can get.
No kidding, the email thread grew to 25 messages in total before I finally received the parcel about a month or so later. It ended up arriving via EMS. I stayed polite the whole time, but I came very close to lodging a dispute in Paypal.
Anyway, so far I still think it was a reasonable deal with the batteries, they were fine for this application which was to get the most W-hrs for the least $ (around 28c/W-hr including shipping). I was only using 30A discharge on an 8S 20Ah configuration (1.5C). I only got about 6.5 Ah out of 10Ah from them on the first really deep discharge (in the race), because one cell got down to 2.1V, no puffing though.
BUT, they all came up OK on recharge, the low cell even came up to 4.2V
Will report back after a few more cycles.