There are more supply packs available than there are fights currently so ultimately it doesn't change anything. I think supply packs shouldn't be sold from vendors, they should be rare drops only. I'm surviving only on food at the moment and the pacing has been fine, supply packs should be rare and for emergency use only.
If anything the opposite. Supply packs should be almost exclusively but broadly available from most merchants, precisely because as a general principle the player should always have a "fallback" solution to get more if things go poorly.
THIS.
Frankly finding packs in the wilderness doesn't thematically make sense, much better to buy them and for them to be relatively widely available, maybe just at different prices depending on location. Nothing wrong with having a bit of a money sinkhole, as one is often swamped with GP anyway.
