Not sure if Tamir is so cheap, you’d have to take cheap catering. I know that Yad Eliezer does provide catering, probably good prices, worth a call, their food was yummy at a chasanah I was at in the summer.
The kibbutz that zaidy mentions is called Moshav Ora. Don’t know their prices.
There’s another hall near Gutnick called Armanot Wolf. Everyone I know who has no $ uses that hall.
There is the new thing of Friday morning chassanahs, but I heard from someone that they’re not so nice – no real seuda, not sure about music, sort of plain, depends on what you’re looking for. The halls are pushing it a bit and giving them for dirt cheap from what I’ve heard during the summer.
There’s a hall in Kiryat Sefer/Modi’in that some people are using, not always so convenient, but if you’ve got people coming from B’nei Brak as well as Yerushalayim, it’s right in the middle.
Mazel Tov and hatzlacha with the preparations.