The custom AV industry, unlike consumer electronics, is not driven by the holiday season. It's rare that someone will build a home theater as a Christmas gift. Custom integration usually is bundled with some sort of remodel project or a cash windfall such as stock transactions or work bonuses. Though someone may want to augment an existing system with a new AV product as a present under the tree.
CNET has some timely tips on shopping for these items with a budget in mind. There's Budget shopping tips: Home audio and Budget shopping tips: Blu-ray players. They contain some very useful information you should keep in mind before you lay your money down.