Long anal probe

Could anyone point me in the direction of a longer anal probe? I’m looking for a silicone one, not the largest diameter one, but a long one. I’ve seen the square peg depth probe and it’s similar to what I want, unfortunately they come in lengths from 15″ to 38″. I’m looking for something about 20″ or so and not expensive at $169. Are there any stores in Canada that carry anything similar?

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