Dang, my local bearing supplier is big, but not that big. Consider yourself lucky. I just found out that Ebay is a great place for bearings, but not in the hobby section, look through the industrial section for the part numbers you need. I purchased 10 6002ZZ-C3 NSK for 15USD. Last time I bought them locally I paid almost $4 each. RC-bearings wants $5.39 and Boca 8.99 plus shipping.

I looked through the manual for the Marz, but it doesn't list bearing sizes. If the sketch is accurate the front should be 6x15x5 (619/6) and rear 7x19x6(607), both common sizes.