Most likely yes.
As far as I know, Daggerfall, for example, is quite (if not very) expensive. Redguard shouldn't be a problem, I've seen many copies sold around the net throughout the years; Battlespire, however, might be a different matter, as I've never seen someone selling it on Ebay.
EDIT: Looks like you're quite lucky. Here's daggerfall sold for $9.99 (only if you don't care about box and manual, it's only the CD): http://cgi.ebay.com/The-Elder-Scrolls-II-Daggerfall-Mint-Condition-PC_W0QQitemZ130236620783QQihZ003QQcategoryZ139973QQssPageNameZWDVWQQrdZ1QQcmdZViewItem