(a) Any political subdivision which becomes a member of any interstate regional planning commission may contract each fiscal year with said interstate regional planning commission to pay a proportionate part of the expenses properly chargeable to the planning services rendered to such political subdivision, and any funds budgeted for interstate planning may be paid over by the political subdivision to the interstate regional planning commission.
(b) An interstate regional planning commission may accept and use funds, grants and services from the federal government or its agencies, from departments, agencies and instrumentalities of any adjoining state, and from any municipality, county or other political subdivision of this or any adjoining state, including municipal, county, regional or other planning commissions of this or any adjoining state, or from private sources, or services from departments, agencies or instrumentalities of this state, and may contract with respect thereto and provide such information and reports as may be necessary to secure such financial or other aid. Within the amounts thus agreed upon and appropriated or otherwise received, any commission may employ such engineers, planners, consultants and other employees as are necessary and may rent or own such space and make such purchases as it deems necessary to its use.