Soil Sampling Equipment Recommendation:

JMC Backsaver N-2 Handle with Sampling Tube ($200-$280)
Best method for plow-layer sampling. Very portable. Footpedal offers extra leverage in dry soils. Several tubes available.

JMC Conventional Handle with Sampling Tube($135-$270)
Works well in tilled soils only. No footstep. Uses same sampling tubes as option one.

JMC T-Handle, Mallet, and JMC Sampling Tube ($220-$390)
Inexpensive method for sampling hard soils. Uses same sampling tubes as Option One.

JMC Low-Cost Sampler with Step ($67)
Works best in tilled soils. Sampling tube is part of the probe.

JMC Low-Cost Sampler ($37)
Cheapest alternative for obtaining occasional samples at lowest cost. Works best in tilled soils. Sampling tube is part of the probe.