REI offers the Columbia Men's Silver Ridge Convertible Pants with a 30" Inseam, 32" Inseam, or 34" Inseam in Fossil for $29.83. (Amazon has them for the same with free shipping for Prime members.) Opt for in-store pickup to avoid the $5.99 shipping fee. That's the lowest price we could find by $5. They're available in waist sizes from 30 to 42, although not in all length/waist combinations. Deal ends September 5.
Of note, they're available with a 34" inseam in Grill (size 42 only) for $14.83 via pickup.