I suggest investing in a strong torch (with good throw - that is length of the beam), red filter and lots of rechargeable batteries. For less than EUR 200 you can have a great kit. Added benefit is that you will see eye-shine which gives away animals from a long distance. Wildlife does not fear red light much - mammals usually cannot see red color. However, more important would be avoiding noise (walking on roads etc), to which night wildlife is extremely sensitive.
Night vision things worth buying are either several times more expensive or prohibited military equipment.