To be really honest, I think a lot of brothers here are a little over-paranoid over the dry cabinet issue. Maybe partly because they have a large collection of precious lens that they don't use frequently. Personally I think that even in our climate, if you are just starting out and have relatively few equipment, you don't need a dry cabinet. The important thing is to use and explore your camera and lenes everyday. If you are worried, you can just get a thirsty hippo and use a tupperware. Don't have to worry if it is too dry inside if you are taking out your camera and lenes almost everyday.
The cheapest dry cabinet that I have come across is the digi-cabi 30l one @$105 with gst from parisilk holland V. However, to get a real auto controlled humidity cabinet will cost a lot more than the $105. The digi-cabi one will flutuate according from day to day and even different time of the day. My digi-cabi one will flutuate around 41%-46% depending on day and time of the day. Anyway, the hygrometer might not even be accurate in the first place.
A dry cabinet is worth it in the long run, but you don't have to jump into buying one immediately unless you are storing equipment rather than using it.