Taking that into consideration, it makes sense that Mystara's Hin, and their nation, militias and "military" (as it were, limited as it is) would craft weapons of their own, rather than just borrow from their human neighbors. With that in mind, I put together the following chart, modified from the D&D Basic Set:
|Hand Axe||1d4||1 Hand||3 gp|
|Battle Axe||1d6||2 Hands||5gp|
|Hin Crossbow||1d4||2 Hands||20gp||May be used 1 handed by larger creatures, Known as a "hand crossbow" to humans and dwarves. Ammo cost is 6gp for 30 quarrels.|
|Short Bow||1d6||2 hands||25gp|
|Hin Bow||1d4||2 Hands||18gp||Too small for use by larger creatures. Ammo cost is 3gp for 20 arrows.|
|Hin Dagger||1d2||1 hand||2gp||Silvered version costs 20gp|
|Hin Greatblade||1d8||2 hands||15gp||Basically the same thing as a human normal sword|
|Hin Sword||1d6||1 Hand||10gp||Basically the same thing as a human Short Sword|
|Hin Smallblade||1d4||1 Hand||5gp||Basically the same thing as a human Dagger.|
|Hin Mace||1d4||1 Hand||3gp||Usable by Clerics|
|Light Club||1d2||1 Hand||1gp||Usable by Clerics|
|Hin Halberd||1d8||2 Hands||4gp|
|Sling||1d4||1 Hand||2gp||Same as human version. Ammo cost is 1gp for 30 stones, or they may be foraged (DM discretion on availability) at the rate of 1d20 per hour.|
|Short Spear||1d4||1 hand||2gp||Also known, among humans, as a javelin|
|Hin Battlehammer||1d4||1 Hand||3gp||Usable by Cleric|
|Hin Smallspear||1d2||1 Hand||1gp||Too small to be used as a missile weapon by larger creatures, may be used by those folk as an improvised stabbing weapon though. Human original is found in the Expert Set.|
|Shortstaff||1d4||2 Hands||1gp||The Shortstaff is about 3.5 to 4 feet long. Human original is found in the Expert Set.|
|Hin Hilt-and-a-half Sword (aka Hin Bastard Sword)||1d4+1 (one Handed)
1d6+1 (two Handed)
|1 or 2 Hands||8gp||Human original is found in the Companion Set.|
|Hin Fork (Hin Trident, among mariners)||1d4||2 Hands||2gp||Human original is found in the Companion Set.|
The Hin versions of the Bola, Blackjack, Net and Whip, from the Companion set are effectively the same weapons as their Human counterparts.
There are no Hin versions of the Blowgun or Heavy Crossbow, from the Companion set. In addition, the Hin are a little less deviously innovative with weapon variants than their Human neighbors, and the only common Pole Arm type found in the Shires is the Hin Halbard, listed above.
Likewise, the Hin are not common practitioners of artillery or siege warfare, and these machines are not usually found within the Shires. Where Catapults and Ballistas are found, they are identical to their Human equivalents, except that when the crew is made up only of Hin, one extra crewman is required per machine.
The basic rule, derived from the D&D 3rd edition Arms & Equipment Guide supplement, is, take the normal, human version (aka "medium sized weapon"), decrease the range by 1/2, rounded up, and drop the damage down to the next lower die type (so 1d6 damage becomes 1d4, etc). Price is roughly 1/2 of the human version, rounded up. This should suffice for a quick conversion of any nonstandard weapons you've added to the lists in the rulebooks.