OK, since people seem confused what to be understood as "night vision equipment usable for wildlife watching with accessible price".
Pulsar Helion XP reviewed by Vollmeise is usable for wildlife watching (image resolution, field of view and size make it practical for watching wildlife). I find it too expensive personally, but since at least one birder bought it, lets treat it as a benchmark. For now this is the cheapest thermal vision equipment (from the sample size of one) which optical performance serves the purpose.
I would be interested in models cheaper up to about the same price, of any kind of night vision, their price, performance and pros/cons for actually watching wildlife in the field.