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Transponders: what should you pay?

What you'll usually pay

$335 typical price

Most are between$65–$2,350

Brand new$295

Used$450

On sale now1,530

💡 Used ones cost about 53% more here.

💚 Best value for your money

Rockwell 75 on sale$149 · 56% cheaper

Narco 85 on sale$150 · 55% cheaper

Collins 147 on sale$200 · 40% cheaper

Unbranded 85 on sale$207 · 38% cheaper

No Warranty 592 on sale$220 · 34% cheaper

Price by compatible make

Rockwell

$149-56%

Not Specified

$330-2%

Avionics

$385+15%

Price by brand

Narco

$150-55%

Collins

$200-40%

Unbranded

$207-38%

Bendix King

$300-10%

Not Specified

$330-2%

Garmin

$795+137%

Price by warranty

No Warranty

$220-34%

Not Specified

$333-1%

🛒 Some on sale right now

How we got these numbers

Worked out from 200 live eBay listings (price range $65–$2,350, odd outliers ignored). These are asking prices, so use them as a guide. Last checked August 15, 2026.