I'm sure they can be glued down somehow, I'm not sure how they're attached to the bumper--I've never taken mine off. I do know that if they're functional, they like to leak...my car looks like it's sad and crying from time to time. I have no idea how much they cost though...and I'd imagine they would have to be painted as well--mine are.

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1984 318i/man./Tornadorot*
1990 525i/man./Alpinweiß*
2001 525i/man./SP/PP/Cosmosschwarz/Sandbeige*
2002 X5 3.0i/man./SP/PP/Sirius/BT/Titansilber/Sandbeige*
2006 330i/man./SP/PP/CWP/Sirius/Blackline/Rear Fogs/Arktis/Grau*
2001 525i/step./SP/PP/CP/CWP/Xenons/Rear Shade/OEM Sirius/OEM BT/OEM AUX/M5 Rear Sway/Bilstein HDs/Beisan Vanos/Rear Fogs/Schiefergrün/Sandbeige*
2012 VW Golf R/Rising Blue*
2013 X1 xDrive35i Alpinweiß/Schwarz/M Sport/Premium/Tech
*retired