Where do you get ammo runts and bomb squigs cheap?

As per title, I’ve got two bomb squigs from the Wrecka Krew box bit need more having bashed the models into both Tankbustas and Breakaboyz. Also none of my squads have ammo runts for their tokens.

For bomb squigs it looks like the only option is laying £30 for AoS squig herd and strapping grenades on. Not keen to buy a whole box just for that, but the bitz sites that part out kits are charging £8 for one squig.

Likewise don’t really want to buy a Gretchin box just for a few ammo runts.

Anyone got any good ideas or do I just suck it up?