If you are unable to pay for expensive grooming then learn how to do it yourself.  If started at young age, the dog quickly learns to appreciate the love and attention you are showing. It is a wonderful bonding mechanism. It is important for these breeds to learn to submit to the higher power... you. You will need a clipper, good pair of scissors, drummel or toe nail clippers, Here is a  nice list I have made up.

Certain things need to be taken care of on a regular basis. combing through beards  after eating is a good idea. one small particle of food can turn into a huge matt quickly. Same goes with furnishings a twig or burr can turn into a matt before you know it. Keeping the furnishings shorter can help a heap. Please do not cut the beards though.

Clean the eyes, the tear ducts can get clogged. Regular ear cleaning is important even for a dog with cropped ears. Teeth, you should get a doggy brush, it they use bumpy nyla bones it can be good enough to take care of that for you.

Here is an easy graphic outline for pet grooming For actual grooming the best website I have seen is the standard schnauzer website. you should groom you giant like a big standard schnauzer.