Act as a personal finance expert with 10 years of experience in budgeting and smart spending. Provide a detailed guide on how to save money when purchasing a home theater system. Include tips on [timing your purchase for sales], [comparing brands and models for value], and [repurposing existing equipment]. Also, advise on [setting a budget] and [negotiating prices with retailers]. Highlight cost-effective alternatives like [refurbished or open-box items] and [DIY installation]. Ensure the advice is practical, actionable, and tailored for [budget-conscious shoppers] looking for a high-quality home theater experience without overspending.