Not any more, ea have suspended buying packs with microsoft points at this time of writing!
no, you must connect to xbox live to download halo 3 map packs.
No, I believe you buy them with either playstation network points, and xbox live points, each map pack is $15 U.S. You can get psn points and xbox live points by buying them through your console online, with a credit card, or b buing a points card at a store.
Yes
The Escalation Map Pack on Xbox Live is priced at 1200 Microsoft points (US)
Xbox live points (Microsoft points) are used to buy things in the Xbox live marketplace. Such as game add-ons!
Some expansion packs are free but most cost Microsoft points:( there is a way to get them for free though but it's against xbox live terms and conditions.
You can buy items on the Xbox Dashboard Marketplace like map packs, trailers, other downloads and games. Also you can buy stuff for your avatar.
Microsoft points (or MS points) are basically the currency on the xbox live marketplace. They enable you to buy gamer pictures, dashboard themes, multi-player map packs and MUCH more downloadable content for the 360 console. They are available in all good game stores and ebay.
yes you can
no not on the Xbox 360 black ops
Nope, all in-console purchases requre xbox live.
15