Yes you can.
You can buy a /24 - /16 easily on the open market for roughly $2.00/IP and tunnel them back to your MTA server, which I believe is what you're really asking here. You will simply need to find an ISP or broker who has the IP's available to sell that match the quality you're looking for in regards to G.I. or TLD. Depending on where you source from, some of them will have a minimum term commit of 2-3 on average, and as high as 6 month. Others will require 2 month pre-pays, or set up fees. It will all really depend on where you sourcing from as there is no 'standard' across the board on price and terms.
Good luck chief.
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