Graham,
Those kits are not identical.
The ebay one is needle bearing and shaft only
The Marksman is Needle Bearing, Sealed Ball Bearing, & Brake side Oil Seal
The WeMoto 2 ball bearings, 1 needle bearing, 1 shaft and 2 seals
That could be the difference in price.
I'd vouch for WeMoto's stuff, so if you do need everything then I'd go with them. If you only need Needle Bearing, Sealed Ball Bearing, & Brake side Oil Seal go with Marksman (and it comes with a Falcon recommendation). The Ebay one seems to offer the least for nearly the most money.
I'll admit I don't know what parts are needed or the actual quality of any of the parts listed or anything about the job really, so probably best ignoring me (as always!)