they're hosing you. The bestkit is no better than any of the others. the interface for steering wheel controls is around $60. Total install would take about 30 minutes at a reputable shop.
I do these on weekends for $35, customer supplies dash kit ($30) wiring harness ($15) antenna adapter ($10) and interface ($60).
I would try a different shop, or ask friends if they have any experience with installs.
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P99rs Head Unit--- Amps- 2 Pioneer Prs800d --- Zapco ST1000MX---Zapco ST-4XSQ---- SI BM mk5 Subs---SI TM65v2 Midbass--- SI M3 mids--- SI M25 xbl2 tweeters ----- 2016 MECA street class 3rd place at world finals
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