Depends how you define Punk. Do you mean the wanky homoerotic New York arthaus stuff like the New York Dolls and Patti Smith banging on about horses? The cartoon Phil Spector lame brain bludgeonings of The Ramones? The Clash spent a little bit too much time hanging around artschool smoking weed, Sandista?!?! The Sex Pistols were another cartoon band made up by Malcolm Mclaren to suit his closetted sexual and monetary desires.... errr.... The Buzzcocks were limp-wristed tunesmiths... The Stranglers were old men hacking away... Sham 69 were a pub rock band chancing it... The Damned were a goth band in disguise (though Rat Scabies used some sort of Violin bass back in the day). The Velvet Underground are again a blugeoning Phil Spector style band who were the play-things of Andy Warhol. Everything after 1980 is not punk but some subset of punk resulting in horrific punk pop. Ah so we must look at those obscure bands on the Nuggets compilation albums, they are punk right? Or maybe The Monks from Germany....
So... you must mean the uber principled bands of all sorts of styles on SST? Those dudes who lived in vans for ten years and made $2 a week from selling merch... Bad Brains? Sorry but they dug up roots reggae and dub influences half the time... errr....What was Mike Watt using in the Minutemen prior to the SG basses? Is that a P bass on Meat Puppets I?


Basically see what "punk" bassists were using and don't do that. Don't play Ricks, the market has driven right up since Kim Gordon was uselessly hacking away at one in the 1980s (with a screwdriver probably). Don't buy those apparently no longer inferior 1970s P basses (because the market has driven those right up because in this economic climate and if you drink enough before playing them you might not notice the worse workmanship). Errrrr, even those lucite Ampeg Dan Armstrong basses are expensive. You are doomed.