I would try ebay.... There are folks selling tail rotor props that look like they might fit. You might try asking the seller if he knows if they fit Reflex or not.
For example:
http://cgi.ebay.com/5-TAIL-ROTOR-BLADE-for-silverlit-picooz-picco-z-rc-heli_W0QQitemZ260424212949QQcmdZViewItemQQptZRadio _Control_Parts_Accessories?hash=item3ca27e21d5&_tr ksid=p3911.c0.m14&_trkparms=65%3A12|66%3A2|39%3A1| 72%3A1205|240%3A1318|301%3A1|293%3A1|294%3A50
This is that seller's store:
http://shop.ebay.com/merchant/h5bjt_...rmrsZ1QQ_fromZ
Also, if too wide, I have read that some people trim the rings on the heli to fit larger props. Poke around on ebay though, you might find the exact prop.