Hi jpadilla - I've only just got into SE razors (my first one, and the other five I've ordered due to getting carried away, are still in transit) so I'm far from well versed on the gear.
These razors will take different blades to a double edge (DE) razor like your Super Speed. The blades for these razors have only one sharp edge (SE. or Single Edge razors) and are often sold by medical supply companies.
If you google single edge blades [Ted Pella apparently makes very good stainless steel blades that are PTFE (teflon) coated, much like many DE blades] you'll be able to see a bit more of them.
SE style blades are also sold as scraper blades (although the ones you should be using to shave apparently have a much better edge, so I'd advise against nipping down to the hardware store for shaving supplies) and there is a much narrower range compared to the DE razor brands.
I hope that helps a bit.
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