My players make regular trade with halflings from their outpost in a valley of the Ringing Mountains (Pallas Valley map and general information - campaign background).
I have their interactions be very binary (yes/no), because halflings are not at ease speaking and trading with potential food (and thinking the traders also see them as food).
I don’t use cp values for the trading, but try to think in terms of “usefulness” and “fancy” values for what the halflings will want to buy. Weapons, tools, clothes, fabric for the useful items, and jewelry, beads, ornaments, music instruments, or colorful items as fancy items for example.
So the deals can be very advantageous for players. Some items worth nearly nothing could be jackpot, and pricy items could be traded for less than their usual market price. Depending on the mood of the halflings, an item that was a big deal once might not gather any attention the next time.
I don’t know if it might be of interest to you, but halflings use giant iguanas, giant apes (gorilla-like) or big cats as pack mounts in my campaign.
Hope it helps