There are a few - Such as these for instance:

eBay.co.uk: MICROSOFT WINDOWS 98 WITH PRODUCT KEY (item 150134599317 end time 25-Jun-07 19:03:19 BST)

or

eBay.co.uk: WINDOWS 98 CD WITH CERT OF AUTHENTICTY AND CODE (item 280127991989 end time 28-Jun-07 22:28:31 BST)

You'd have to check the listing carefully or ask the seller but as far as I'm aware that's not 98 SE.

If that's no good to you, try the search string "Windows 98 -boot" as that will remove most of the useless boot discs that you came across.