You can buy the foam ones at Shoppers drug mart. Buy a few, try them on yourself first. Also, if your kids are young (not yet teens) i'd put them in for them. Its really hard to get them stuck, but still, with kids, better safe than sorry.
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Hot: 2001 Estoril M Roadster
ZCP 19's michelin supersports, ZHP knob, JL 8W3
Cold: 2002 TiAg M3 6mt deoranged, dechromed, led tails, ZHP knob, UUC SS v3, GROM, OEM 18's w310's,
Fun: 2006 YZF-R6, black, ohlins, pazzo, cat delete, vance hines csone, YEC racing tune