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Newegg has the Sans Digital TowerRAID+ TR4M+BNC 4 Bay eSATA Port Multiplier JBOD Tower + HighPoint RocketHybrid 1222 PCI-Express 2.0 x1 SATA III (6.0Gb/s) Controller Card for $80 with free shipping. Features four 3.5" drive bays, and a 150W power supply. 
$80
How many bays does it have?
The title says 4.
The description says 3.
And what is the deal with the controller card?
It is pci-e x1, which maxes out at 500mb/sec.
Not a problem, except it has two ports that are rated at 6giga bits per second.
How does that math work?
It's a four bay enclosure.
The math works fine: you can plug a 20 GB/s cable into a card that will run 500 MB/s through it, and you'll get 500 MB/s. You're constrained by the slowest link in the whole system. If you're using one (spindle) drive in the enclosure, you're only going to get 100-200 MB/s anyway. If you're using multiple drives, RAID 0 or something, your performance will drop due to the port multiplier in the enclosure and the low-end controller you have it plugged into.
Number of PCI-E lanes are the least of your concerns here.