How about St. Croix Chassis
www.stcroixchassis.webs.com I sell the steel 1 1/4" split lock with out the key for $4.25 each or I also sell the 1 1/4" Aluminum split collars with 1/4" keyway for $4.75 each.
Prices are plus shipping, I don't play shipping games, I like to use flate rate boxes where possible or UPS for the larger orders. Check out my site, give me a call with any questions; I am still updating my site so there are many things not back on it right now. I stock all the good parts to help build your mowchines at the best possible prices. Give me a call if there is something you need a price on if it's not listed on the site.
Thanks,
Robert Sparbel
SCC
St Croix Chassis