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Wiki:
extended standard shell:
When fired from the M198 155mm towed howitzer (39 caliber tube) with the M203A1 propelling charge, the maximum range would be between 26.5 km (threshold) {16.46miles} and 28.5 km (objective) {17.70 miles}. Same for M-777. Longest observed shot from a M777 was 22 miles

The maximum range when fired from a Crusader type system (52 caliber tube) would be 34 km (threshold) {21.12 miles} to 36 km (objective) {22.36 miles}. Extending the range of the M795 HE projectile provides the ability to engage at an even greater distances and provides for a munitions which is compatible with current and developmental delivery systems and their associated propellants.

These extended standard shells (XM982 Excalibur GPS-guided munition) cost ~US$5,000 each. Finned and GPS guided, with a dispersion, across its entire range, of 10 meters, circular error probable of 5 m (16 ft).

2S35 Koalitsiya-SV 152mm self-propelled howitzer, range 30 - 70km. This may not be on the field yet and is so new that its production may be held up by sanctioned parts. Range of fire with standard projectile is around 30km (18.64 miles) and around 40km (24.85 miles) with rocket-assisted projectile, if were any made.

[These extended standard shells (XM982 Excalibur GPS-guided munition) cost ~US$5,000 each. Finned and GPS guided, with a dispersion, across its entire range, of 10 meters, circular error probable of 5 m (16 ft).]

This is what I got from a recent article:

https://www.fieldartillery.org/news/army-to-cut-155-mm-artillery-spending-citing-budget-pressure
[Funding for the M982 Excalibur precision-guided round, which is reported separately from other 155 mm ammunition, would fall slightly under the FY-22 budget request, to $73.5 million, from $76.8 million in the FY-21 budget appropriation.

Unit costs would more than double to $176,624 per round in FY-22, from $80,948 in FY-21.]

Since these are basically short range guided missiles fired from a howitzer, I figured they wouldn’t be cheap.