Looking at the Blogging the Bracket tracker, here are known MTEs with spots still available:
- Gulf Coast Showcase: Ball State (258 NET) plus 7 others. Southern Illinois (116 NET) and Eastern Kentucky (219 NET) appear to also be in this based on tweets and schedule releases, but the tracker is missing them, so looks like 5 spots available in reality.
- Jacksonville Classic: Rhode Island is in this, so we can't be. Detroit Mercy is also in, but the tracker is missing them.
- Arizona Tip-Off Desert Division: Merrimack (213), New Mexico State (289), and Pepperdine (226) are in this, with 1 spot available. It would be games against two of those in Tempe, plus a road game at Butler, Mississippi State, Northwestern, or UNLV.
- Baha Mar Hoops Nassau Championship: Arkansas State (148), Iona (210), and Rice (241) are in this, with 5 more spots available.
- Missouri MTE: Missouri (158), Pacific (359), and Arkansas Pine-Bluff (328) are in with 1 spot remaining.
And here are last year's NETs for all the teams Blogging the Bracket says are not yet linked to an MTE, removing the small handful that I've seen actually appear to be in an event.
28 Indiana State
73 Richmond
95 Cornell
99 Louisiana Tech
106 Morehead State
112 Hofstra
129 UT Arlington
137 Troy
140 Chattanooga
145 Tarleton State
154 Weber State
164 Bryant
188 Saint Peter’s
194 Marist
196 Cleveland State
198 Tulsa
200 Harvard
221 Austin Peay
222 Georgia State
225 Columbia
228 Bowling Green
248 South Alabama
249 Central Connecticut
260 Western Illinois
261 Coppin State
262 UTSA
263 Citadel
267 Lehigh
276 Oral Roberts
282 Tennessee State
290 Wagner
305 Delaware State
324 Fairleigh Dickinson
330 NJIT
334 Dartmouth
335 Manhattan
338 Army
341 Florida A&M
347 Incarnate Word