I just had a quick look on RC Champ's site (to see if I could find out rough prices for the spares and 1-way) and found this picture...
http://rc-champ.co.jp/501_49401.jpg Do you think they're planning on selling a few?

I have a feeling all the spares and option parts for the 501 will be special order via Hobby Co, which is a pity as if I break it I'll have to wait 2 months for parts. I really hope they get the 501 in as a regular stock item (even if only a dozen or so at a time) and provide proper spares backup on it. I hate ordering spares for my cars off the net, but sometimes it's the only way. All the hopups for my DF-03 came off the net, simply because they are not available over here. Even the genuine Tamiya items, which Hobby Co's computer said weren't available, were already selling on ebay. Pity really as it means they (Hobby Co) are losing business.

-Steve