So according to Sickels' scouting on minorleagueball.com, the offer was one A- player (Walker), one B+ player (Franklin), one C+ player (Pryor) and Furbush. I don't see a similar offer on the Braves side -- doesn't necessarily mean they won't get a deal done. But I did go through his other grades and try to find a logical landing spot that can give up similar prospects. Let's have some fun. Sorted roughly in descending order of who I think wants Upton the most.
Rangers: 3B Mike Olt (A-/B+), SP Martin Perez (B), SP Neil Ramirez (C+) and RP Michael Kirkman. The Rangers say they're out, but the Diamondbacks may be able to get their best deal here, thanks to Texas' ML depth, if they can just give up on snagging Profar.
Braves: SP Julio Teheran (B), SP J.R. Graham (B), SS Nick Ahmed (B-) and RP Jordan Walden. Teheran and Graham are Sickels' top-two Braves prospects, but you can sub either for Gilmartin, Spruill or Wood, if you like. ARI would have to still be high on Teheran for this to work.
Phillies: SP Jesse Biddle (B+), 3B Cody Asche (B-), SP Ethan Martin (B-) and RP Phillipe Aumont (C+). I doubt this will be enough to get a deal done. Domonic Brown is probably available, but the D-Backs already have too many OFs.
Orioles: SP Kevin Gausman (A-), 2B/SS Jonathan Schoop (B), SP/RP Steve Johnson (C+) and RP Pedro Strop. I like Baltimore for a mystery team, as Upton can replace the McLouth/Reimold duo. Not sure if there are new draft trade rules -- Gausman may not be eligible for trade yet.
Tigers: 3B/OF Nick Castellanos (B+/A-), RP Bruce Rondon (B), SP Casey Crosby (B-) and SP Drew Smyly. A lot to give up for Detroit, but if they shift Torii to LF, imagine facing Jackson/Hunter/Cabrera/Fielder/Upton/Martinez as a starting pitcher.
Royals: SP Yordano Ventura (B), SP Kyle Smith (B), 3B Chelsor Cuthbert (B-) and RP Kelvin Herrera. Probably don't have enough to get a deal done after the Tampa trade, plus they probably don't want to pay Francoeur all that money on the bench.
Cubs: SS Javier Baez (A), SP Arodys Vizcaino (B-), 3B Josh Vitters (C+/B-) and RP James Russell. The Cubs don't have many hi-level arms available, and their best one (Vizcaino) is a risky trade chip while recovering from TJS.
Red Sox: SP Matt Barnes (B+), SP Allen Webster (B/B+), SS Jose Iglesias (C+) and RP Junichi Tazawa. Leaves Boston pretty light in high-level pitching prospects, and Ellsbury would probably have to be dealt, moving Victorino to CF.
Indians: SS Francisco Lindor (A-), SP Mitch Brown (B-), RP Cody Allen (B-) and RP Vinnie Pestano. Doesn't make as much sense for the Indians with Swisher in the fold, unless they move Reynolds to DH and let Swish play 1B. Lindor should peak the D-Backs' interest.
Pirates: SP Jameson Taillon (A-), SS Alen Hanson (B+), SP/RP Kyle McPherson (C+) and RP Mark Melancon. I can't see the Pirates giving up either of their top SP prospects with their MLB rotation looking slim, but who knows?
Mets: SP Noah Syndergaard (A-/B+), 2B/3B Wilmer Flores (B+), RP Jeurys Familia (B-/B) and SP/RP Jeremy Hefner. This may be an even better offer than that of the Mariners, but they probably don't have the money and it goes against their strategy (on the surface, at least).
Rays: SP Chris Archer (B+), SP/RP Alex Colome (B-), SS Hak-Ju Lee (B-) and RP Jake McGee. Rays always have minor-league depth to burn, but trade probably doesn't make sense with Myers waiting in wings. Upton probably too expensive for Tampa.