As long as your unit has the standard, threaded Lindel valve, you should be fine. I'm pretty sure that the Peak 1 does have the Lindel valve. You can burn any of the brands of Lindel valve fuel cannisters: Brunton, MSR, Primus, Jet Boil, Snow Peak, and Coleman. Snow Peak is usually the cheapest if it's available in your area. Snow Peak may actually have the 70/30 mix if I remember correctly. Most of the other brands have less propane and more isobutane/butane. REI carries Snow Peak, and I believe they'll ground ship to US addresses.

You got a good price by the way!

Addendum: here's a link to the REI site: http://www.rei.com/product/643061
This is the smaller size, which is good for backpacking. There is a larger size that is better IMHO for camping, but I didn't see a link for it. I'm sure you can find the larger size if that's what you need if you shop around.