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Fast (more properly called AllTheWeb) and Ink both offer free submissions, Ink thru a few of the portals that use Ink data. The advantage to paid submissions is prompt and frequent spidering.
My opinions: This service is valuable for Ink since they are historically "sluggish" about spidering. Since AllTheWeb normally respiders their entire database within a few weeks, paid inclusion is of little value.
PositionTech was the first to offer this service and their service to me over 4+ years has been good enough that I haven't felt the need to explore other options.