I don't think the price difference is that much.
I got my set of A1 pedals last year, they cost me $288 Aus ($227 US). Including the usb adapter.
The ones on the act labs site are exactly the same as mine and are going for $168 US but it looks like thats without the usb adapter. So with the extra $29.95 US for that it brings the total to $197.95 US ($251 Aus).
So the price difference is only really $30, which is a bit but i guess it could be justified by the bulk amount of pedals A1 are selling to Act labs or maybe the exchange rate at the time of the sale.
Either way.. I've had my pedals for a little over a year now and i can't fault them. They have excellent pedal feel and the adjustable springs mean you can get the perfect amount of resistance on each pedal and the throttle is recessed a little so it lines up nicely with the brake pedal under brakes. Also the weight in the base stops them sliding all over the floor.
I also just recieved my A1 shifter this week and it's just as impressive as the pedals. Another solid metal product. I reckon i could run over it in my car and it'd still work fine.