I may sound not quite in the picture here, but isn't it more expensive to buy via eBay rather than direct from the retailer.
JE Models:
http://www.jemodels.com/index.php?si...arch--type=ALL
JE Models Via eBay:
http://www.ebay.co.uk/itm/Yokomo-YZ-...gAAOSwl8NVeyJs
Also if you note on the ebay listings JE say they will despatch next day but Apex give a date which is considerably further away.
In that sense they have covered themselves in terms of holding the stock or not as they can take the order and still deliver it to the customer within the timeframe that they have stated on eBay.
I think the safest bet is if you are in a hurry for the part order direct from JE everyone will be happy and the sun will shine on a race track (with any luck) LMAO
Just a thought