Grand Design 399m vs Jayco Jay-Flight-Slx

Searchshop currently shows 2 listings for the Grand Design 399m from 2 dealers alongside 1,675 listings for the Jayco Jay-Flight-Slx from 36 dealers, with prices and dealer locations updated continuously. On price, the Jayco Jay-Flight-Slx runs roughly 84% below the Grand Design 399m at the median ($22,995 vs $141,549), which adds up across the typical loan term. Listings span model years 2026–2026 for the Grand Design 399m and 2016–2027 for the Jayco Jay-Flight-Slx, so there's flexibility on both sides whether you're cross-shopping new, late-model, or used.

A live-data comparison like Grand Design 399m vs Jayco Jay-Flight-Slx gives recreational vehicles buyers a more realistic picture than spec sheets alone — the prices shown here reflect actual dealer asking prices, not MSRP. When evaluating recreational vehicles at this price point, experienced buyers typically weigh tow vehicle compatibility, slide-out count, floorplan layout, and fresh/gray water capacity alongside the headline number. The Jayco Jay-Flight-Slx currently carries the lower median asking price, which compounds meaningfully over a 48-to-72-month financing term — even a modest gap per month adds up to hundreds of dollars by payoff. Broader selection from the Jayco Jay-Flight-Slx side gives buyers more negotiating room and reduces the chance of settling on a unit that's slightly off on color, trim, or mileage. Request a dealer walkthrough that covers the roof seams, slideout seals, and holding-tank systems — issues in those areas are the most common source of expensive post-purchase repairs on recreational vehicles. Factor in campground fees, insurance, and seasonal storage costs when comparing total ownership cost between these two models, since those ongoing expenses often exceed the monthly payment difference. Listings refresh continuously as dealers update their feeds — check back if a specific recreational vehicles you're tracking changes in price or status.