The employer pays the petition filing charge and any optional premium processing, both published in the USCIS fee schedule. The larger cost is usually the work of assembling corporate and employment evidence.
Government charges are published; the evidence work is the variable
Hypothetical example: L-1 is an employer-filed petition, so the filing charge falls on the company rather than the transferee, and the current amounts are set out in the USCIS fee schedule. Premium processing is optional and buys a faster decision. Around those fixed numbers sits the real expense: reconstructing share registers after a reorganisation, obtaining certified corporate records, preparing an accurate organisation chart, and having someone competent write a support letter that describes managerial authority rather than repeating a job title.
For a dealership that has never filed before, budget for that preparation honestly. Also budget for the possibility of a request for further evidence, which is common where the qualifying relationship runs through a holding company. Paying for speed before the corporate record is straight is the wrong order; a premium-processed request for evidence arrives quickly and still stops the file.