I got myself a lawn sweeper specifically so I could use the grass clippings as mulch. I collected enough to mulch my garden fairly completely the first use. Where the mulch is thick enough, it really stops the weeds. I'm using the clippings on my potatoes, too, instead of hilling them up with dirt. We'll see how that works. So far the tops look happy. As to the mini-tillers, you should be able to find one of the cheap ones on sale for $200 or less. I have a Ryobi that I've used for 2-3 years now. Got it for something like $100-$150 I think. Except on the really hard crust that forms on my garden soil after a long dry spell, it works pretty well. I was using it yesterday on the areas between where I had mulched and it was pretty effective. Another aspect of the mulch is how well it conserves the moisture. We had early heavy rains this spring, but none now for over a week. The uncovered soil is getting pretty hard, but around my tomatoes and peppers, where I mulched heavy, the top of the soil is still damp and soft. I was chasing earthworms with the tiller when I'd catch the edge of the grass clippings while tilling the weeds between rows. As said above, you should let the clippings dry and brown some before using them right on the plants, but I'm going to throw the green clippings between the rows as I get them.
Chuck