Set A: 4x Half Tracks
Got these from another gamer at Historicon 2014. They are nicely painted and are solid. I do not think they are Battlefront’s but are 15mm and look awesome on the table next to battlefront figures. Two of them come with 50 cal AA MG and 2 with 30 cal ones. The 30 cals were replaced and are mounted on top of magnets (in case you want to switch them).
Set B: 5x Half Tracks
You can bring them straight into an Armored Rifle Platoon (grunts not supplied). Two of these have 50 cal AA MG and the other 3 regular 30 cal AA MG. These were bought long time ago on eBay when I was starting to play Flames of War. They have been upgraded by adding magnets (for easier transport), painting the seats, decals and re-touching them. One of the 50 cal MG was replaced and the replacement was mounted with magnets (in case you want to switch it).
If you prefer to buy them, Battlefront retails half tracks for around $13 USD. I would like to get something like that plus shipping. (Considering they come painted, that is a bargain).