This is a hot title. Highly collectible as part of the Gerry Anderson stable of characters and some other TV tie-ins like Land of the Giants The Champions and particularly the first time that we saw an original UK Star Trek comic strip. Some very striking cover art throughout the run.
High grade copies are really hard to find, with no horizontal crease and no newsagents' name on the covers.
The free gift press-out Mac's Car with issue #1 is rare and could easily add £125-£200 to the value if unused. A set of #1-33 sold on eBay UK in Aug 2009 for £269.66, described as a garage find with No. 1 having a grubby cover and fraying to the spine otherwise generally in quite good condition with dusty edges.
Big thanks to Mark Arrand for some great Joe 90 Annual, Storybook and other pictures that you'll see in the Joe 90 titles.
Note: some PR issues may have no value. Selected issues in FN, VF or VF/NM may not exist in some titles.