When the supply is low, mageweave bags can get close to 2g a bag. But rather than go backwards and get cloth that you aren’t getting normally, since you’re now in the netherweave levels, I’d suggest the netherweave bags. I don’t know how popular imbued versions are (18 slot) at 40g but the netherweave bag (16 slot) are just about 10g, which is generally affordable for many players.
You could also sell your netherweave, use that money to buy mageweave and runecloth, and turn the profit for mageweave and runecloth bags. So it’s kind of like you’re farming mageweave and runecloth without going to those zones.