Price comparison of parts

Show price comparisons and deal alerts for bike components directly in the app. When a user views a component (chain, cassette, etc.), show current prices from multiple retailers and notify them when parts go on sale.

Users need to:

• Replace worn components but don't know current market prices
• Miss out on sales/deals because they're not actively shopping
• Waste time manually checking multiple bike shops
• Buy at inopportune times (paying full price when deals are available)

Especially problematic when:

• Component wear is predictable ("I'll need a chain in 3 weeks")
• Users could wait for a deal if they had advance warning
• Bulk buying would be cheaper but users don't think about it

Basically an idealo function build in.