Keeping your son warm and comfortable while paddling (and swimming) will really help increase the fun value and help him enjoy kayaking more months than July/Aug. A drytop (latex neck gasket) or semi-dry paddle/splash jacket (neoprene neck gasket) is an excellent investment. I started my kids out using farmer john style NRS wetsuits with either a fleece top or a neoprene top under the top. I liked the wetsuits as they had padded knees, good knee protection for lower volume small rivers.
Bomber Gear has a few close-outs left at good prices (Bomber Gear
), especially their skirts. good prices on skirts. A medium tunnel BG skirt is slightly big on my son who weighs 125. Bungee rand skirts are usually easier to put on/pull off than rubber rand skirts.
Immersion Research (Welcome to Immersion Research
) has some great deals on close-outs (see End of Season Sale), especially for paddle jackets and semi-drytops.
Keep an eye on ebay for some cheap "off-season" prices on NRS wetsuits.