The listing, Canada - #371-372 UPU set of 2 mint from 1957 has ended.
Canada #371-372 mint, never hinged complete set of 2 from 1957.
The 15¢ value has a higher catalog value (over $2.10), therefore a higher than usual starting bid.
I only have 4 of these sets, the scan shows one of them and is representative of what you will receive.
GIN of 5500 points is available (technically only worth $1 in terms of me getting an Amazon card, as such, less than half the catalog value!), but only if there are no bids on the lot.
Postage is free within USA, but $1.60 outside the USA (PayPal accepted).
My general terms for stamp-related Listia lots can be found here (please read, it answers a lot of basic questions):
http://listiarules.webs.com/