FWIW here's what I got from prowheelbuilder.com for $500. I wanted a real rugged wheel set so I over-stated my weight and specified "Really Hard Use" - I think they'd flag the parts selected if they don't measure up to that requirement.
(I had to add that spoke wrench to get it over $500 to get free shipping.)
If you go with prowheelbuilder keep an eye on the availability of the components you select - I wasn't paying attention to that and had to wait a couple months because they had to wait for the rims.
I'm very satisfied with these wheels and prowheelbuilder.com.
Front Hub SHUTTER PRECISION PD8 (ALL AXLE TYPES) DYNAMO ISO 6 BOLT DISC BLACK Price $139.00
|Drillings 32
|Axle Width QR Front 9x100mm
Front Lacing Pattern Lacing: Three Cross
Front Nipple SAPIM POLYAX 14MM 14 GAUGE BLACK BRASS NIPPLE Price $0.15
Front Rim WTB KOM TOUGH TCS I 25 29IN BLACK RIM Price $86.00
|Drillings 32
|Size 700c/29er
|Tubeless Tape and Valve for 1 wheel Installed (Not available as Rim Only) + 13.00
Front Spoke SAPIM RACE J BEND BLACK DOUBLE BUTTED 14|15|14G OR 2.0|1.8|2.0MM SPOKES Price $1.24
Use Really Hard Use
User Weight 240
Wheel Build Weight 1104.96Rear Wheel
Rear Hub SHIMANO XT FH M756 SIX BOLT BLACK DISC REAR HUB Price $70.00
|Drillings 32
|Axle Width QR Rear 10x135mm
|Shimano HG/SRAM 8,9 or 10spd (Dyna-sys 11 spd compatible)
Rear Lacing Pattern Lacing: Three Cross
Rear Nipple SAPIM POLYAX 14MM 14 GAUGE BLACK BRASS NIPPLE Price $0.15
Rear Rim WTB KOM TOUGH TCS I 25 29IN BLACK RIM Price $86.00
|Drillings 32
|Size 700c/29er
|Tubeless Tape and Valve for 1 wheel Installed (Not available as Rim Only) + 13.00
Rear Spoke SAPIM RACE J BEND BLACK DOUBLE BUTTED 14|15|14G OR 2.0|1.8|2.0MM SPOKES Price $1.24
Use Really Hard Use
User Weight 240
Wheel Build Weight 1190.96
PARK SW-40 BLACK .127 FOUR SIDED SPOKE WRENCH