It's rare for second hand stuff to come up for the polo's.
Intercooler wise, Forge and SeatSport are generally the two most used. There's other brands that evade me at the moment. Check out some of the build threads on this forum. These are generally sufficient for the large majority of applications and requires least effort to fit. SeatSport requires cutting of the back of the bumper and grille, though done right isn't obvious once fitted. You'll need to source appropriate piping and whatnot. Forge can be had as a complete kit.
Coilovers depend on your budget. H&R, Bilstein, KW, JOM, ST, Weitec, AP, BC to name a few.
Thread - Coilovers.
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