If you need to fix your drains quickly, then you should consider using an electric drain snake. These snakes are metal cables that can be twisted into the drain in order to clear anything which is blocking the drain, and which often feature an auger at the other end to winch it in and out. The use of these snakes is not limited to a professional, so if you want to use an electric drain snake to get the clog out of your drain, then you can manage it yourself in a few spare hours.
PEX is cheaper than copper. Half-inch PEX tubing costs about a third the price of copper. Some of the savings will be offset by the need for a special tool to install the fittings, but if you are doing a medium to large plumbing job, you will usually save by using PEX instead of copper. PEX will not corrode like copper. If you live in an area with acidic water, copper can corrode over time. PEX is unaffected by acidic water and is therefore a better choice in these areas.